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Goodwill and Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table presents our goodwill and intangible assets as of December 31, 2018 and 2017: 
 
December 31,
 
2018
 
2017
 
(In millions)
Goodwill
$
8,120

 
$
8,229

Intangible assets with indefinite lives
1,400

 
1,479

Intangible assets with definite lives, net
592

 
830

 
$
10,112

 
$
10,538
Changes in Goodwill by Reportable Segment
The following table presents the changes in goodwill by reportable segment:
 
Core OTA
 
trivago
 
HomeAway
 
Egencia
 
Total
 
(In millions)
Balance as of January 1, 2017
$
4,703

 
$
516

 
$
2,591

 
$
132

 
$
7,942

Additions
124

 
—

 
—

 
—

 
124

Foreign exchange translation and other
13

 
72

 
65

 
13

 
163

Balance as of December 31, 2017
4,840

 
588

 
2,656

 
145

 
8,229

Additions
—

 
—

 
31

 
—

 
31

Impairment charge
(86
)
 
—

 
—

 
—

 
(86
)
Foreign exchange translation and other
(13
)
 
(27
)
 
(5
)
 
(9
)
 
(54
)
Balance as of December 31, 2018
$
4,741

 
$
561

 
$
2,682

 
$
136

 
$
8,120
Components of Intangible Assets with Definite Lives
The following table presents the components of our intangible assets with definite lives as of December 31, 2018 and 2017:
 
December 31, 2018
 
December 31, 2017
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
 
(In millions)
Customer relationships
$
659

 
$
(419
)
 
$
240

 
$
665

 
$
(304
)
 
$
361

Supplier relationships
650

 
(426
)
 
224

 
655

 
(368
)
 
287

Technology
544

 
(510
)
 
34

 
532

 
(441
)
 
91

Domain names
159

 
(83
)
 
76

 
132

 
(70
)
 
62

Other
450

 
(432
)
 
18

 
452

 
(423
)
 
29

Total
$
2,462

 
$
(1,870
)
 
$
592

 
$
2,436

 
$
(1,606
)
 
$
830
Estimated Future Amortization Expense Related to Intangible Assets
The estimated future amortization expense related to intangible assets with definite lives as of December 31, 2018, assuming no subsequent impairment of the underlying assets, is as follows, in millions:
2019
$
185

2020
143

2021
97

2022
73

2023
39

2024 and thereafter
55

Total
$
592